pub(crate) type Aes256<'a> = Aes<'a, 15>;
pub(crate) struct Aes256<'a> { rk: &'a [__m128i; 15], rk2: [__m256i; 15], }
rk: &'a [__m128i; 15]
rk2: [__m256i; 15]